Company's Derivatives on Consolidated Financial Statements of Operations (Details) (Foreign Currency Forward Contract, Other Income (Expense), USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Foreign Currency Forward Contract | Other Income (Expense)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amount of (Loss) Gain Recognized in Income	$ 2,023	$ (58)	$ 2,948	$ 155